ENG-10038: Use Union instead of Conditional Or For DownloadCheckpointTypeChoice Typing (#177)

* Use Union instead of |

* Add default case for training type as full

* Swap from union to future annotations

---------

Co-authored-by: Arsh Zahed <[email protected]>

Author: azahed98

src/together/cli/api/finetune.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import json
 from textwrap import wrap
 

src/together/types/finetune.py

@@ -230,7 +230,7 @@ class FinetuneResponse(BaseModel):
     @field_validator("training_type")
     @classmethod
     def validate_training_type(cls, v: TrainingType) -> TrainingType:
-        if v.type == "Full":
+        if v.type == "Full" or v.type == "":
             return FullTrainingType(**v.model_dump())
         elif v.type == "Lora":
             return LoRATrainingType(**v.model_dump())